I bathe Bailey every 2-4 months. I don't have a yard, so it's not like she is rolling in dirt all day long. If just her feet are dirty from the park, I just stick her in the sink and clean her paws.
She gets more baths in warmer months, usually every 4-6 weeks because she is outdoors more and I like to let her air dry, which is easier in the summer. In the winter, she gets less baths. She is outside less and it's just too cold.
She does get trimmed every 3-5 weeks (paws, ears & poop shoot). Nails, are checked once a week and trimmed as needed (usually every 2 weeks). During high shedding season, she is brushed every other day. When she is not heavily shedding, she gets a quick brush once a week.
However, I must admit I haven't been the best furmom lately. She hasn't had a bath in about 3 or 4 months and hasn't been brushed in about 2 weeks. The holidays have been very busy and she is just so darn difficult to brush!!

I have to fight her to brush and groom her. She used to be okay with getting her paws trimmed and nails cut, but lately she doesn't even want that to be done. She will attack the brush and dremel. Nothing comes easy with this dog. I dream about having a dog who will just lay down for gentle brushing.